package com.mada.utils.http;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.*;
import java.util.Map.Entry;

/**
 * org.apache.http.client下操作远程url
 *
 * @Auther: madali
 * @Date: 2018/8/16 10:39
 */
public class HttpClientUtil {

    public static String get(String url) {
        return get(url, null);
    }

    public static String get(String url, String param) {
        CloseableHttpClient httpClient = HttpClients.createDefault();// 通过址默认配置创建一个httpClient实例
        CloseableHttpResponse response = null;
        String result = "";

        try {
            String urlNameString = StringUtils.isEmpty(param) ? url : url + "?" + param;
            // 创建httpGet远程连接实例
            HttpGet httpGet = new HttpGet(urlNameString);
            // 设置请求头信息，鉴权
            httpGet.setHeader("Authorization", "Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0");
            // 设置配置请求参数
            RequestConfig requestConfig = RequestConfig.custom()
                    .setConnectionRequestTimeout(500)
                    .setSocketTimeout(2000)
                    .build();
            // 为httpGet实例设置配置
            httpGet.setConfig(requestConfig);
            // 执行get请求得到返回对象
            response = httpClient.execute(httpGet);
            // 通过返回对象获取返回数据
            HttpEntity entity = response.getEntity();
            // 通过EntityUtils中的toString方法将结果转换为字符串
            result = EntityUtils.toString(entity);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            doFinally(response, httpClient);
        }
        return result;
    }

    public static String post(String url) {
        return post(url, null);
    }

    public static String post(String url, Map<String, Object> paramMap) {
        // 创建httpClient实例
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse httpResponse = null;
        String result = "";

        // 创建httpPost远程连接实例
        HttpPost httpPost = new HttpPost(url);
        // 配置请求参数实例
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectionRequestTimeout(500)
                .setSocketTimeout(2000)
                .build();
        // 为httpPost实例设置配置
        httpPost.setConfig(requestConfig);
        // 设置请求头
        httpPost.addHeader("Content-Type", "application/x-www-form-urlencoded");
        // 封装post请求参数
        if (null != paramMap && paramMap.size() > 0) {
            List<NameValuePair> nvps = new ArrayList<>();
            // 通过map集成entrySet方法获取entity
            Set<Entry<String, Object>> entrySet = paramMap.entrySet();
            // 循环遍历，获取迭代器
            Iterator<Entry<String, Object>> iterator = entrySet.iterator();
            while (iterator.hasNext()) {
                Entry<String, Object> mapEntry = iterator.next();
                nvps.add(new BasicNameValuePair(mapEntry.getKey(), mapEntry.getValue().toString()));
            }

            // 为httpPost设置封装好的请求参数
            try {
                httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }

        try {
            // httpClient对象执行post请求,并返回响应参数对象
            httpResponse = httpClient.execute(httpPost);
            // 从响应对象中获取响应内容
            HttpEntity entity = httpResponse.getEntity();
            result = EntityUtils.toString(entity);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            doFinally(httpResponse, httpClient);
        }

        return result;
    }

    private static void doFinally(CloseableHttpResponse httpResponse, CloseableHttpClient httpClient) {
        // 关闭资源
        if (null != httpResponse) {
            try {
                httpResponse.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if (null != httpClient) {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}
